Release Details

CARLSBAD, Calif., July 29 /PRNewswire-FirstCall/ -- Isis Pharmaceuticals, Inc., (Nasdaq: ISIS) announces the following webcast:

     What:   Isis Pharmaceuticals 2004 Second Quarter Financial Results



     When:   Thursday, August 5 at 10:00 AM (EDT)



     Where:  http://www.firstcallevents.com/service/ajwz408899305gf12.html or
             www.isispharm.com



     How:    Live on the Internet.  Simply log onto either of the web sites
             listed above.



     Contact: Alison Trollope
     Investor Relations
     (760) 603-3880

If you are unable to participate during the live event a replay of the webcast will be available at www.isispharm.com for up to 30 days.

Isis Pharmaceuticals, Inc. is exploiting its expertise in RNA to discover and develop novel human therapeutic drugs for its pipeline and for its partners. The company has successfully commercialized the world's first antisense drug and has 11 antisense products in development to treat metabolic, cardiovascular, inflammatory and viral diseases and cancer. Through its Ibis Therapeutics® program, Isis is developing a biosensor to identify infectious organisms, and discovering small molecule drugs that bind to RNA. As an innovator in RNA-based drug discovery and development, Isis is the owner or exclusive licensee of more than 1,400 issued patents worldwide. Additional information about Isis is available at www.isispharm.com

This press release includes forward-looking statements regarding our business, the financial position of Isis Pharmaceuticals, and the therapeutic and commercial potential of our technologies and products in development. Any statement describing our goals, expectations, intentions or beliefs is a forward-looking statement and should be considered an at-risk statement, including those statements that are described as Isis' clinical goals. Such statements are subject to certain risks and uncertainties, particularly those inherent in the process of developing technology and systems used to identify infectious agents, in discovering and commercializing drugs that are safe and effective for use as human therapeutics and in the endeavor of building a business around such products and services. Actual results could differ materially from those discussed in this press release. As a result, you are cautioned not to rely on these forward-looking statements. These and other risks concerning Isis' research and development programs are described in additional detail in Isis' Annual Report on Form 10-K for the year ended December 31, 2003, and quarterly report on Form 10-Q for the quarter ended March 31, 2004, which are on file with the U.S. Securities and Exchange Commission. Copies of these and other documents are available from the company.

Ibis Therapeutics® is a registered trademark of Isis Pharmaceuticals, Inc.

SOURCE  Isis Pharmaceuticals, Inc.
    -0-                             07/29/2004
    /CONTACT:  Alison Trollope, Investor Relations of
Isis Pharmaceuticals, Inc., +1-760-603-3880/
    /Web site:  http://www.firstcallevents.com/service/ajwz408899305gf12.html
                http://www.isispharm.com /
    (ISIS)



CO:  Isis Pharmaceuticals, Inc.
ST:  California
IN:  HEA MTC
SU:  CCA MAV



SF-AC 
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6313 07/29/2004 07:55 EDT http://www.prnewswire.com